System and method for direct measurement of alignment error in a fiber coupler

摘要: A system and method for directly measuring the alignment error in a fiber-optic coupler is disclosed. In one embodiment, an optical switch utilizes beam deflection mirror. When mirror directs incident light to particular fiber, may enter fiber at location offset from center of fiber. reflected opposite end returns exits exactly The difference between entry exit points results return path different than path. This be used impinge upon quadrant detector, whose anode currents then contain direct measurement distance on